<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket 客户端</title>
</head>
<body>

<script type="text/javascript">
    var socket;
    if(window.WebSocket) {
        socket = new WebSocket("ws://localhost:8899/ws");
        socket.onmessage = function (event) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n" + event.data;
        }

        socket.onopen = function(event) {
            var ta = document.getElementById("responseText");
            ta.value = "连接开启！"
        }
        socket.onclose = function (event) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n" + "连接关闭！";
        }

    } else {
        alert("浏览器不支持WebSocket")
    }

    function send(message) {
        if(!window.WebSocket) {
            return;
        }
        if (socket.readyState == WebSocket.OPEN) {
            socket.send(message)
        } else {
            alert("连接尚未开启！");
        }
    }
</script>

<form onsubmit="return false;">
    <textarea name="message" style="width: 400px; height: 200px"></textarea>
    <input type="button" value="发送数据" onclick="send(this.form.message.value)">
    <h3>服务端输出：</h3>
    <textarea id="responseText" style="width: 400px; height: 300px"></textarea>
    <input type="button" onclick="javascript: document.getElementById('responseText').value=''" value="清空数据">
</form>

</body>
</html>